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धातु के एक तार की लंबाई L तथा परिच्छेद का क्षेत्रफल A है। यदि इसका यंग मॉडुलस Y हो और यह स्प्रिंग की तरह कार्य करें तो स्प्रिंग नियतांक बराबर होगा

(A) \(\frac {YA}L\)

(B) \(\frac{2YA}L\)

(C) \(\frac {YA}{2L}\)

(D) \(\frac{YL}A\)

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सही विकल्प है (A) \(\frac {YA}L\)

मान लीजिए कि बल F लंबाई L के तार में एक विस्तार x उत्पन्न करता है

प्रतिबल = \(\frac FA\) , विकृति = \(\frac xL\)

\(Y = \frac{F/A}{x/L} = \frac{FL}{xA}\)

स्प्रिंग नियतांक, \(K = \frac Fx = \frac{YA}L\)

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